Pump-piston.



G. T.- RANDOLPH.

PUMP PISTON.

APPLmATmN FILED ocT.1G.|915.

,t f r UIA aww/nto@ GEORGE T. RANDLPH, 0F YALE, ILLINOIS.

PUMP-PISTON.

Maasai.

To all whom t may concern Be it known that l, GEORGE T. RANDOLPH, a citizen of the United States, residing at Yale, in the county of Jasper and State of Illinois, have invented certain new and useful Improvements in Pump-Pistons; and I do hereby declare the following to bea full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to improvements in pistons for pumps being especially designed for use in oil wells or other deep wells, and it has for its object to provide means whereby the piston valve may be unseated when necessary, as for example, to permit the es cape of gas that may have accumulated in the piston between the piston and standingr valve, or to permit the liquid to flow through the piston to the standing valve to reprime this valve.

To these ends the invention consists in certain novel details of construction and combination and arrangement of parts al1 as will be now described and the particular features of novelty pointed out in the appended claims.

Referring to the drawings wherein is illustrated the preferred embodiment of the invention: Figure l is a vertical sectional view of a pump piston embodying the present invention with the parts in normal position. Fig. 2 is a similar view showing the position of the parts when the piston valve is raised or unseated. y

Similar letters of reference in the several figures indicate the same parts.

in the drawings the letter A indicates the tubular body of the piston carrying the cups or packing rings B, having a valve seat C at the upper end closed by valve D, in the present instance a ball valve. rlhis ball valve D is inclosed in a cage E which is screwed upon the upper end of the body of the piston and 'is adapted to be connected with the sucker or piston rod. It frequently happens that it is necessary to unseat the piston valve in pistons to permit the escape of gas that may have been drawn into the piston between the piston valve and standing valve, or for other reasons. To accomplish this a stem or rod F is provided vertically movable within the body of the piston having an enlargement y at its upper end which is adapted to strike against the valve D and move it Jfrom its seat, as shown in Specification of Letters Patent.

Patented flug. 29, lltlll.

Application filed October 16, 1915. Serial No. 56,266.

Fig. 2. In order to guide the rod F in its movements, thev strainer disk or plate G at the upper end of the piston is provided with a central opening g through which the stem works, and at its lower end this stem F passes through a central opening h in the strainer cap H screwed to the lower end of the piston. Normally the stem or rod F is held depressed or out of contact with the valve D by means of a coiled spring l encircling the stem F at the lower end, one end of which spring abuts against a nut f screwed on the lower end of the stem F, the other end abutting against the bottom of the strainer cap H. lThis cap H is provided or formed with a hollow tubular extension z/ within which the spring is received when compressed, as shown in Fig. 2. ln order to lock the nut f on the stem, a jam nut f2 is employed, and the cap l-l is prevented from turning and becoming detached from the body of the piston, with the consequent dropping of the cup leather by reason of the pressure of the spring ll exerted against the cap.

ln the normal operation, the parts are in the position illustrated in Fig. l, the plunger or stem being held retracted and the piston valve seated. lf for any reason it becomes necessary to unseat the valve, the piston is lowered below its normal stroke so that the end of the plunger stem will come in contact with some iixed part of the apparatus, as for example, the cage of the standing valve, when the plunger stem will be raised against the tension of the spring and the piston valve raised, as will be readily understood. As soon as the piston is raised the stem will be returned to normal position by the action of the spring.

What is claimed is l. ln a pump, the combination with a re ciprocating piston, a valve seating at the upper end of the piston, a vertically movable stem working in said piston, and adapted to be moved upwardly against the valve to unseat the same, guides for the stem at the upper and lower ends thereof, and a spring for normally holding the stem out of Contact with the valve.

2. In a pump, the combination with a reciprocating piston, a valve seating at the upper end of the piston, a stem having an enlargement at its upper end movable vertically in the piston., and adapted to be moved upwardly against the valve to unseat the same, guides for the stem at the upper and the piston, a nut screwed to the lower end 10 lower ends thereof, and a spring for reof the stem, and a spring encircling the stem tractng the Stem to permit tbe valve to be and confined between the strainer cap and Seated. nut whereby the cap and nut will be pre- 3. In' a pump the combination with a revented from becoming loose, said spring eiproeatng piston, a valve seating at the upnormally liolclng` the stem retracted with 15 per end of the piston, a stem movable in Said the valve seated. piston against the valve to unseat the Same,

a strainer cap screwed to the lower end of GEORGE T. RANDOLPH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C. 

